Why does a tab call Your First Snyc keep opening? It says Setup Complete Firefox logo Your data is now being encrypt

Your data is now being encrypted and uploaded in the background. You can close this tab and continue using Firefox.

A tab keeps opening in all of my synced PCs & laptops. It says
Setup Complete
Firefox logo
Your data is now being encrypted and uploaded in the background. You can close this tab and continue using Firefox.

See these articles for some suggestions:
*https://support.mozilla.org/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox
*https://support.mozilla.org/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols
If you do not keep changes after a restart then see:
*http://kb.mozillazine.org/Preferences_not_saved